CN 120, User Manual

Page: 8 / 21

Page 8
For installation with operational pressure >0.5 bar and pressure expansion, principle diagram pages
17 & 19 must be used
•
If the operational pressure of the vessel exceeds 0.5 bar over pressure, the boiler unit (the installed
boiler including fittings and safety equipment) is covered by the Pressure Equipment Directive
97/23/EEC ”Installation of pressurised equipment”, which requires that the boiler unit must fulfill
certain essential safety requirements regarding the safety equipment of the boiler etc.
The boiler
must be fitted with a cooling spiral amongst other things
The boiler including fittings and safety equipment must be installed in accordance with the principle diagrams
on pages 17 and 19. The engineer must test the safety equipment in accordance with the section "Testing
the safety equipment" before the system is handed over to the user. The following fittings and safety
equipment etc. must, in accordance with the above-mentioned principle diagrams, be installed in the boiler
unit in order to be covered by the CN Maskinfabrik A/S Construction Test Certificate:
The boiler must be installed with pos. nos. 1, 2, 3, 4, 6, 7, 9, 10, 13 (drawings pages 17 & 19)
Description Type / Requirements Draw. Pos
nos. Supplier
Shunt valve TA type TRV 300 1 CN (supplied)
Oper. thermostat BS components type NTC-2322 2 CN (supplied with stoker)
Overheating thermostat Honeywell type L6188 3 CN (supplied with stoker)
Boiler thermometer 0-120 degrees 4 Installation engineer
Pressure gauge
(manometer) 0-3 maximum 5 bar, red marks at 2.5 bar 4 Installation engineer
Pressure expansion
vessel CE labeled minimum 4 % of total system
water volume (see table below) 6 Installation engineer
Safety valve
CE approved 2 pces., 2.5 bar, clearance minimum 20
mm
7 Installation engineer
Cooling spiral
CN 80:
CN120:
Wieland heat exchanger type WRK 13
Wieland heat exchanger type WRK 13
9
9
CN (supplied)
Safety thermostat Honeywell type TS130, CE approved 10 CN (supplied with stoker)
Water shortage protection RT 200 Pressostat 13 Installation engineer
NOTE:
•
The system must have a membrane type expansion vessel with airbag. The expansion vessel must
have a durable and solidly fastened rating plate which clearly states Manufacturer, Volume in litres,
Test Pressure in bar and Initial Pressure in bar
•
The expansion hose between the expansion vessel and the rest of the system must not be less than
25mm.
•
Safety valve : The safety valve must be installed in accordance with the directions of The Health and
Safety at Work Act 1974.
•
Expansion vessel : Expansion vessels : The vessel must be installed in accordance with the
directions of The Health and Safety at Work Act 1974.
•
Size of expansion vessel closed system:
Calculation of pressure expansion
Water expansion in % from 10 °C
Average temperature
°C
%
60 1.7
70 2.3
80 3.0
90 3.6
100 4,4